Thanks again everyone, my DuetWifi and HEVO are back in sync. Have put back my BLTouch to replace the Orion as it was ticking me off, once i get some better prints I mat put it back.
BLTouch is now dialed in and I just need to tweak the prints to stop extraneous links between parts - another self inflected issue I'm sure.
Not replacing the cracked carriage until it fails completely - it's a royal PITA replacing it and setting up again IMHO
Have made note to self that whenever I monkey around with the hotend and/or carriage I run an autotune, fan on fill, before i do anything else ;o)